Heater for coal-screens



(No Model.) 2 Sheets-Sheet 1.

F. L. SHALLENBERGER.

HEATER FOR GOAL SCREENS.

No. 362,793. Patented May 10,1887.

(No Model.) 2 Sheets-Sheet 2.

P. L. SHALLENBERGER. HEATER FOR GOAL SCREENS.

No. 362,793. Patented May 10. 1887.

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NiTan STATES ATENT Fries.

FRANK L. SHALLEJBERGER, OF BRADDOOK, ASSIGNOR TO CARNEGIE, PHIPPS & 00., (LIMITED,) OF PITTSBURG, PENNSYLVANIA.

HEATER FOR COAL-SCREENS.

SFECIFIC'ATION forming part of Letters Patent No. 362,793, dated May 10, 1887.

Application filed November 11, 1886.

To all whom it may concern:

Be it known that I, FRANK L. SHALLEN- BERGER, aresident of Braddock, in the county of Allegheny and State of Pennsylvania, have invented certain new and usefulImpi-ovements in Heaters for Coal-Screens; and I do hereby deelare that the following isa full, clear, and exact description ofthe invention,which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and in which Figure 1 is a side elevation in outline of a coal-tipple complete, showing its different parts and indicating the position of the cars into which the coal and dust are discharged after screening. Fig. 2 is a perspective view of one ofthe screens with its hopper and heating device, one side being broken away in part to show the interior arrangement of the heating device. Fig. 3 is a longitudinal vertical section of the screen with its hopper and heating device, and Fig. 4 is a vertical transverse section of the same.

Like letters of reference denote corresponding parts'in the several figures.

My invention relates to a certain improvement in coal-screens, having for its object to provide means whereby the screen, as well as the hopper forming part thereof, may be heated in cold weather. Operators of coal-mines, as is well known, experience considerable dit'ticulty in screening coal in cold and wet weather, from the fact that the wet coal and slack will freeze to the screenbars and to the sides and bottom of the slack" or dust hopper, thereby choking up and obstructing the same, so as to seriously interfere with the operation of screening, besides causing delay and loss of time and labor in removing the coal and slack which adheres to the screen and screen-hopper.

It is the object of my invention to avoid this difficulty by providing the coal-screens and their hoppers with a heating attachment or device for keeping them dry and warm; and to this end I have devised the heating att-achment or apparatus which will be hereinafter more fully described and claimed.

In the accompanying drawings, A denotes the coal screen or screens, and 13 the dust or Serial No. 218,597. X0 model.)

slack hopper secured thereto. The bottom J of this hopper is, as usual,pitehed atagreater angle than the screen proper, so as to readily carry off the waste product to and through the dust-chute E to a car or suitable receptacle placed below.

The letter H on Fig. 1 denotes the weighpan, and E is the conveyer chute or chutes by which the screened and sorted coal is conveyed to the cars or bins.

The hopper B is provided with a false bottom, consisting of a series of plates, CO G, extending transversely across the bottom J of the hopper, from side to side, and forming a series of steps overlapping one another, as shown. These steps or plates 0 are fastened to the sides of the hopper, either permanently or removably, in any suitable manner, and may be supported at their overlapping ends by short posts or supports F. An apertureis made in the true bottom of the hopper for the insertion ofa pipe or fine, D, connecting the hopper with any suitable heat-generator.

From the foregoing it will be seen that the heat from the generator will enter the space formed between the true and false bottom of the hopper, from which itwill be diffused over the entire length and width of the hopper, underneath the overlapping steps or plates which form the false bottom, thus keeping said false bottom dry and warm and preventing coal dust and slack from sticking to it. The heat then escapes through the openings or spaces between the successive steps formed by said plates and ascends up into the body of the screembetween the screen-bars, keeping them, as well as the sides of the screen box or frame, dry and warm also, and thereby preventing the wet coal from freezing to the bars or frame, so that the work of screening may continue without interruption even in the coldest weather.

Having thus described my invention,l claim and desire to secure by Letters Patent of the United States 1. The combination, with a coal-screen, of a hopper secured thereto, the bottom of which is provided with an aperture, a false bottom within said hopper forming a heating space or chamber, said false bottom being provided with openings for the escape of the heat up ICO into the hopper and between the screen-bars, pipe, substantially as and forthe purpose set 10 and a heat-inlet pipe, substantially as and for forth. the purpose set forth. In testimony that I claim the foregoing as 2. The combination,with a coal-screen, of a my ownIhave hereunto affixed my signature in 5 hopper secured thereto, the bottom of which is presence of two witnesses.

perforated, a chute, a series of overlapping FRANK L. SHALLENBERGER. plates, posts at the overlapping ends of said Witnesses: plates, said plates and posts forming a false CHAS. A. CLOUES,

bottom within said hopper, and a heat inlet 0. 0. SMITH. 

